The primary action of the hormone oxytocin is?

Uterine contraction

the hormone of love and cuddle chemical....

It signals the beginning of the process of birth. The uterus will begin to contract and the uterine lining will break ("water" breakage). Basically, it triggers a woman's body to expel the fetus.

uterine smooth muscle contraction





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Letdown reflex ? in lactating (breastfeeding) mothers, oxytocin acts at the mammary glands, causing milk to be 'let down' into a collecting chamber, from where it can be extracted by sucking at the nipple.

Uterine contraction ? important for cervical dilation before birth and causes contractions during the second and third stages of labor.

Oxytocin is secreted into the blood at orgasm ? in both males and females.

Due to its similarity to vasopressin, it can reduce the excretion of urine slightly.

Oxytocin and oxytocin receptors are also found in the heart in some rodents, and the hormone may play a role in the embryonal development of the heart by promoting cardiomyocyte differentiation.

Oxytocin secreted from the pituitary gland cannot re-enter the brain because of the blood-brain barrier. Instead, the behavioral effects of oxytocin are thought to reflect release from centrally-projecting oxytocin neurons, different from those that project to the pituitary gland. Oxytocin receptors are expressed by neurons in many parts of the brain and spinal cord, including the amygdala, ventromedial hypothalamus, septum and brainstem.